/**
 * Copyright (C) 2013 DaiKit.com - daikit4gxt module (admin@daikit.com)
 *
 *         Project home : http://code.daikit.com/daikit4gxt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.daikit.daikit4gxt.client.editor;

import java.util.Stack;

import com.google.gwt.editor.client.EditorContext;
import com.google.gwt.editor.client.EditorDelegate;
import com.google.gwt.editor.client.EditorVisitor;
import com.google.gwt.editor.client.ValueAwareEditor;
import com.google.gwt.editor.client.impl.AbstractEditorDelegate;
import com.sencha.gxt.widget.core.client.Component;


/**
 * Visitor validating all Editors initialized in the driver.
 * 
 * @author tcaselli
 * @version $Revision$ Last modifier: $Author$ Last commit: $Date$
 */
public class DkPreFlushValidator extends EditorVisitor
{
	private final Stack<AbstractEditorDelegate<?, ?>> delegateStack = new Stack<AbstractEditorDelegate<?, ?>>();

	private final boolean validateHiddenFields;

	/**
	 * Constructor
	 * 
	 * @param validateHiddenFields
	 */
	public DkPreFlushValidator(final boolean validateHiddenFields)
	{
		this.validateHiddenFields = validateHiddenFields;
	}

	@Override
	public <Q> void endVisit(final EditorContext<Q> ctx)
	{
		// Flush ValueAware editors
		final ValueAwareEditor<Q> asValue = ctx.asValueAwareEditor();

		AbstractEditorDelegate<?, ?> delegate;
		if (ctx.getEditorDelegate() == null)
		{
			delegate = delegateStack.peek();
		}
		else
		{
			delegate = delegateStack.pop();
		}
		assert delegate != null;

		if (asValue != null)
		{
			if (validateHiddenFields || !(asValue instanceof Component) || ((Component) asValue).isVisible(true))
			{
				asValue.flush();
			}
		}
	}

	@Override
	public <Q> boolean visit(final EditorContext<Q> ctx)
	{
		final EditorDelegate<Q> editorDelegate = ctx.getEditorDelegate();
		if (editorDelegate != null)
		{
			delegateStack.push((AbstractEditorDelegate<?, ?>) editorDelegate);
		}
		return true;
	}
}
